The other day I found SUPER nice Dumbo HMPK make at Petco for $12, so I bought him, of course :) But that got me thinking about breeding him, and the dumbo gene. Why is it seen only in HMPKs? Is expression possible with other tail types? How inheritable is it say with a male who expresses it and a female non carrier? In a hypothetical spawn with 100 fry how many will have a dumbo phenotype? Im thinking about spawning him as he is a bubble nest machine, not to mention nearly symmetrical with a nice blue butterfly HMPK female if I can find one.

I know from what i've seen a dumbo to a dumbo will produce alot/all dumbo fry.
Not sure how it fares against a regular betta.

Most of the dumbo's i've seen are giant hmpk salamanders. So that would probably explain why yours is a plakat, easier to find and breed in mass quantities to breed. That also goes for his coloring( I see some of the white butterfly outlining that goes with salamanders, though you're boy looks blue and not pinkie purple).